And if you are on the Moon, you might leave some boot prints.
From NASA: http://www.nasa.gov/multimedia/imagegallery/image_feature_69.html
Apollo 11 bootprintOne of the first steps taken on the Moon, this is an image of Buzz Aldrin's bootprint from the Apollo 11 mission. Neil Armstrong and Buzz Aldrin walked on the Moon on July 20, 1969. Photo Credit: NASA.
More Sepia images at: http://sepiasaturday.blogspot.com/2013/04/sepia-saturday-174-27-april-2013.html